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Protein & Digestion
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The Shadow
Guest
...if the bosy could not process but 30 grams.....Ronnie Coleman would poop entire undigested steak
sorry......visual - but it works
sorry......visual - but it works
Yeah, I thought it to be weird. 
...btw Shadow, you sort of ignored a few ?s I asked on the other thread about eating PWO stuff and other stuff..and stuff 
Sassy69
New member
Some informative articles:
http://bodybuilding.about.com/cs/nutrition/a/aa041703a.htm
How much protein do you need? http://exercise.about.com/cs/nutrition/a/protein.htm
The Protein Roundtable: http://www.bodybuilding.com/fun/berardi77.htm
The Fat Loss King: An Interview w/ Lyle McDonald: http://www.wannabebig.com/article.php?articleid=93
This last one addresses teh question directly on the first page ---
Wannabebig: Well I'm sure you've been asked this question many times, but since it's always being debated I have to ask you. There's a nasty myth in circulation right now claiming that only 30 grams can be taken in. How much protein can the body assimilate at one time?
Lyle M: Well, I think part of the problem has to do with what you mean by 'assimilate'. That is, you sometimes see the '30 grams per meal' (or whatever it is) to mean how much the body can digest, utilize, or what have you. But nobody seems to really want to nail down what they are talking about.
Wannabebig: Ok, let me rephrase the question: "how much protein can the body handle in one sitting?"
Lyle M: I consider all of this "The body can only use X grams per Y" as a lot of nonsense. First and foremost, it makes no evolutionary sense (how I've been looking at a lot of physiological processes lately). That is, our ancestors did not eat protein in small amounts throughout the day. Yet, anthropological studies show that they had more muscle and bone mass than most of us. Rather, they were more likely to eat a ton of protein after a kill, and whatever amount they got from vegetables and such the rest of the time. Massive protein intakes at once were more likely the norm during 99% of our evolution than not. This means that our guts evolved to handle it. In addition, when you start looking at digestion and such, you see exactly that: even with massive protein loads (I vaguely recall they've looked at like 1.5 g/kg of beef all at once), digestion still stays very high (on average 90-95% for animal proteins meaning you're losing at most 10 grams of protein/100 grams ingested). The body can digest/absorb pretty much anything you throw at it. You won’t be pooping protein if you eat 35 grams at a sitting, is what I'm saying.
Now, a slightly separate issue might be one of how much protein (amino acids really) the liver can handle at once. If the recent studies on whey vs. casein have pointed anything out, it's that flooding the liver with amino acids at a high rate leads to increased amino acid oxidation (burning) in the liver. I suppose it's conceivable that high protein intakes at any given meal could be having this effect. I suspect it depends on the source of the protein (whole food which digests slowly vs. protein powders which digest faster). That is, consuming, say, 50 grams of whey protein at once might lead to more waste (mainly as amino acids oxidized and then converted to urea) than 50 grams of casein or beef. But that's more an issue of speed of digestion than amount per se.
http://bodybuilding.about.com/cs/nutrition/a/aa041703a.htm
How much protein do you need? http://exercise.about.com/cs/nutrition/a/protein.htm
The Protein Roundtable: http://www.bodybuilding.com/fun/berardi77.htm
The Fat Loss King: An Interview w/ Lyle McDonald: http://www.wannabebig.com/article.php?articleid=93
This last one addresses teh question directly on the first page ---
Wannabebig: Well I'm sure you've been asked this question many times, but since it's always being debated I have to ask you. There's a nasty myth in circulation right now claiming that only 30 grams can be taken in. How much protein can the body assimilate at one time?
Lyle M: Well, I think part of the problem has to do with what you mean by 'assimilate'. That is, you sometimes see the '30 grams per meal' (or whatever it is) to mean how much the body can digest, utilize, or what have you. But nobody seems to really want to nail down what they are talking about.
Wannabebig: Ok, let me rephrase the question: "how much protein can the body handle in one sitting?"
Lyle M: I consider all of this "The body can only use X grams per Y" as a lot of nonsense. First and foremost, it makes no evolutionary sense (how I've been looking at a lot of physiological processes lately). That is, our ancestors did not eat protein in small amounts throughout the day. Yet, anthropological studies show that they had more muscle and bone mass than most of us. Rather, they were more likely to eat a ton of protein after a kill, and whatever amount they got from vegetables and such the rest of the time. Massive protein intakes at once were more likely the norm during 99% of our evolution than not. This means that our guts evolved to handle it. In addition, when you start looking at digestion and such, you see exactly that: even with massive protein loads (I vaguely recall they've looked at like 1.5 g/kg of beef all at once), digestion still stays very high (on average 90-95% for animal proteins meaning you're losing at most 10 grams of protein/100 grams ingested). The body can digest/absorb pretty much anything you throw at it. You won’t be pooping protein if you eat 35 grams at a sitting, is what I'm saying.
Now, a slightly separate issue might be one of how much protein (amino acids really) the liver can handle at once. If the recent studies on whey vs. casein have pointed anything out, it's that flooding the liver with amino acids at a high rate leads to increased amino acid oxidation (burning) in the liver. I suppose it's conceivable that high protein intakes at any given meal could be having this effect. I suspect it depends on the source of the protein (whole food which digests slowly vs. protein powders which digest faster). That is, consuming, say, 50 grams of whey protein at once might lead to more waste (mainly as amino acids oxidized and then converted to urea) than 50 grams of casein or beef. But that's more an issue of speed of digestion than amount per se.
